Method for changing A356 alloy primary aluminum liquid using cerium-enriched mixing rare earth

Abstract

The invention relates to a method for modifying raw aluminum liquid of A356 alloy with cerium-rich mixed rare earth. The specific technical scheme is (1) the raw aluminum liquid of A356 alloy is melted in an industrial mixing furnace, and the melting temperature is controlled at 710-740°C. The time is controlled at 90-150min, the first magnetic stirring time is 20-40min, the first refining temperature is 680-700°C, and the first refining time is 30-60min; (2) The modifier is aluminum-mixed rare earth intermediate Alloy: Al-6~7wt%RE, the mixed rare earth is cerium-rich mixed rare earth, in which the cerium content is greater than 70wt%; the material to be modified is the original aluminum liquid of A356 alloy; (3) after the first refining slag removal, add Add an aluminum-cerium-rich mixed rare earth master alloy to the original aluminum liquid, and the amount of cerium-rich mixed rare earth added is 0.03wt%-0.1wt%; (4) The modification temperature is 720-735°C; (5) The modification time is 10-30min; (6) Magnetic stirring for the second time, the stirring time is 5-15min; (7) After reaching the metamorphic time, carry out the second refining, the second refining temperature is 670-690°C, and the second refining time is 20-50min; (8) Pouring after standing, the pouring temperature is controlled at 650-680°C. Its advantages are: good metamorphism effect, small burning loss, good heredity, and low cost.

Description

1. Technical field

[0001] The invention relates to a method for modifying A356 alloy primary aluminum liquid by using cerium-rich mixed rare earth, and belongs to the technical field of aluminum alloy modification technology. 2. Technical background

[0002] A356 alloy has more modifiable elements, such as sodium, strontium, rare earth and so on. Now, strontium modification technology is commonly used in industrial production. However, because strontium modification technology has disadvantages such as easy burning of strontium, poor heredity, and easy inhalation, enterprises and users need to find a new method that can be used in industrial production. The element that directly modifies the original aluminum liquid of A356 alloy. After laboratory research, it was found that rare earths are ideal metamorphic elements. However, no industrialized production technology has been found in the industry to use cerium-rich mixed rare earths to directly modify the primary aluminum ...

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